/*
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * Copyright (c) 1999-2001 Apple Computer, Inc.  All Rights Reserved. The
 * contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License.  Please
 * obtain a copy of the License at http://www.apple.com/publicsource and
 * read it before using this file.
 *
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.  Please
 * see the License for the specific language governing rights and
 * limitations under the License.
 *
 *
 * @APPLE_LICENSE_HEADER_END@
 *
 */
/*
	File:		OSMutex.h

	Contains:	Platform - independent mutex header. The implementation of this object
				is platform - specific. Each platform must define an independent
				OSMutex.h & OSMutex.cpp file.
				
				This file is for Mac OS X Server only

	

*/

#ifndef _OSMUTEX_H_
#define _OSMUTEX_H_

#include "PlatformHeader.h"
#include <stdlib.h>

#ifndef WIN32
#include <sys/errno.h>
	#if __PTHREADS_MUTEXES__
		#include <pthread.h>
	#else
		#include "mymutex.h"
	#endif
#endif

#include "OSHeaders.h"
#include "OSThread.h"
#include "MyAssert.h"

class OSCond;

class OSMutex
{
	public:

		OSMutex();
		~OSMutex();

		inline void Lock();
		inline void Unlock();
		
		// Returns true on successful grab of the lock, false on failure
		inline Bool16 TryLock();

	private:

#ifdef WIN32
		CRITICAL_SECTION fMutex;
		
		DWORD		fHolder;
		UInt32		fHolderCount;
		
#elif !__PTHREADS_MUTEXES__
		mymutex_t fMutex;
#else
		pthread_mutex_t fMutex;
		// These two platforms don't implement pthreads recursive mutexes, so
		// we have to do it manually
		pthread_t 	fHolder;
		UInt32		fHolderCount;
#endif

#if	__PTHREADS_MUTEXES__ || WIN32		
		void		RecursiveLock();
		void		RecursiveUnlock();
		Bool16		RecursiveTryLock();
#endif
		friend class OSCond;
};

class	OSMutexLocker
{
	public:

		OSMutexLocker(OSMutex *inMutexP) : fMutex(inMutexP) { if (fMutex != NULL) fMutex->Lock(); }
		~OSMutexLocker() {	if (fMutex != NULL) fMutex->Unlock(); }
		
		void Lock() 		{ if (fMutex != NULL) fMutex->Lock(); }
		void Unlock() 		{ if (fMutex != NULL) fMutex->Unlock(); }
		
	private:

		OSMutex*	fMutex;
};

void OSMutex::Lock()
{
#if	__PTHREADS_MUTEXES__ || WIN32
	this->RecursiveLock();
#else
	mymutex_lock(fMutex);
#endif //!__PTHREADS__
}

void OSMutex::Unlock()
{
#if	__PTHREADS_MUTEXES__ || WIN32
	this->RecursiveUnlock();
#else
	mymutex_unlock(fMutex);
#endif //!__PTHREADS__
}

Bool16 OSMutex::TryLock()
{
#if	__PTHREADS_MUTEXES__ || WIN32
	return this->RecursiveTryLock();
#else
	return (Bool16)mymutex_try_lock(fMutex);
#endif //!__PTHREADS__
}

#endif //_OSMUTEX_H_
